As the Pope ends his visit to Britain, historian Dr Thomas Dixon delves into the BBC's archive to explore the troubled relationship between religion and science. From the creationists of America to the physicists of the Large Hadron Collider, he traces the expansion of scientific knowledge and asks whether there is still room for God in the modern world.

The subject matter for episode three surrounds the influence of religious, military and economic powers throughout history and subsequent conflicts and collaborations. Since the time of the Greeks, philosophers and religious leaders have sought truth and yet the pursuit of knowledge has often involved hidden motivations including the thirst for power and control.